Electrical receptacle plug



Feb. 4, 1936. w. F. MclNTosl-i 2,030,016 K ELECTRICAL RECEPTACLE PLUG Filed Jan. 7, 1935 Ihr M1. Jaw

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3'; /dzwny l l l /l l l l l l l l l /l/ l l/ Patented Feb. 4,11936 UNITED STATES PATENT OFFICE ELECTRICAL RECEITACLE PLUG William F. McIntosh, Charlestown, Mass.

Application January 7, 1935, Serial No. 675

l Claim.

My present invention relates to contact plugs and more particularly to an electrical receptacle contact plug.

, My improved contact plug is particularly adaptable for heavy duty use where high voltage current is used such as portabledrills and similar electrical devices but the principle involved in my improved plug is applicable for any use which may require a plug-in cord.

'I'he principal object of my invention is therefore an improved electrical receptacle cord plug.

Another object is an electrical plug of the class described in which is combined in combination individual standard cartridge fuses.

Another object is an electrical fused plug in which the fuse members are maintained in positive contact by means of tension springs.

Another object is a simple means for removing and replacing burned out fuses.

the construction and operation of my invention will appear as the description of the same pro gresses.

In the drawing illustrating the preferred' embodiment of my invention Fig. 1 is aside elevation of the plug assembled.

Fig. 2 is also a side elevation as viewed at ninety degrees from Fig. 1.

Fig. 3 is a side elevation with one-half of the plug'casings removed and Fig. 4 is a. cross section taken on the line 4--4 of Fig. 3.

Referring more in detail to the drawing, I0 and comprise two duplicate halves which form the 5 base ofgthe plug.

cate halves which form the insulated casing of the said plug, being securely clamped together by means of the threaded screw I4 at one end and another threaded screw I5 which also passes through the base members I0 and I I.

Bosses I6 and I'I, formed around the screwholes in the bases III and I I on the inner sides of the said base members, are adapted to engage in recesses Il and I3 in the broad sides of the insulated casing members I2 and I3. 'I'hese recesses I8 and I3 with. their engaging bosses I6 and Il provide additional locking means between the casings I2 and I3 and the base members III and II.

On the inner faces of the casings I2 and I3, I

:o have provided semi-circular grooves 20 and 2| extending from end to end of the members I2 and I3. Within the semi-circular recesses 2|, I have provided a pair of duplicate contact members comprising a plug portion 22 and a base member :.5 23. Base member 23 comprises a cylinder one Other objects and novel features comprisingv I2 and I3 comprise two dupli.

(Cl. 20o-115.5)

end of which is bored out at 24 to receive one end of a standard cartridge fuse 25 and a compression spring 26 located behind the end of the cartridge fuse as shown in. Fig. 4. A recess 21 provided in the upper half of the cylindrical member 23, has its bottom connected with the outer end of the member 23 by means of an opening 28 through which electrical contact wires 29 may be inserted and pushed around the cylindrical sides of the recess 21 for the purpose of attaching securely thereto by means of screws 3II. The casing I2 is provided with a recess 3| in which the end of the screw 30 is inserted for the purpose o-f anchoring the cylindrical base member 23 in place as shown in Fig. 4.

Contact pins 22 are provided with a base portion 32 the rear end of which is recessed at 33 to form a receptacle 34 for the purpose of receiving the front end of said cartridge fuse. Slots 35 are provided inthe member 34 for the purpose of introducing a spring tension on the end` of the cartridge fuse. At 3E, I have provided an annular groove which is adapted to seat over a pin 31 1ocated in the casing I2 along the bottom of the semi-circular recesses 20 and2 I ,such that the contact pins 22 are securely held in place'when the casing members I2 and I3 are together as shown in the drawing. v

In actual use, the cartridges 25 may be easily removed by loosening the screws |4, I5, and 38 and lifting pins 22 until the annular groove 36 ,is raised from the pin 3l at' which time pin 22 and fuse 25 may be removed and a new fuse inserted in the member 34 and re-assembled by pushing the fuse and pin 2| down against a compression spring 26 until the annular groove 36 is engaged over the pin 3l, at which time the screws I4, I5, and 38 are again tightened. l

In the two halves of the base members III and I I I have provides an opening for an electrical cable 33 to be inserted and vhave provided annular ribs 40 around the inner side of the cable opening such that when the screws 33 are securely set up, the cable 39, which is the conventional heavy rubber insulated type, takes the form as,v shown in Fig. 3, the annular rib sinking into the rubber insulation of the cable 39 thereby securely locking the said cable within the base members I0 and I I.

While I have shown a particular modification of the use whereby my improved contact plug may f be utilized, it is to be further understood that further application of the invention is intended with all types of electrical assembly.

Having thus described my invention, what I claim is:

An improved cartridge fuse electrical plug comprising a split insulating member and a split base member, said base member having an electrical cable opening therein and annular grooves located around the inner surface o1' said openings adapted .to engage said cable, a cartridge fuse contact pin assembly comprising a contact pin and receptacle for one end of said fuse and a recessed base member and compression spring adapted to receive the other. end of said fuse and providc tension on the said fuse between said contact pin and recessed base members, "a second recess located on said base member adjacent its back end an anoffset openlngconnectlng said recess at its bottom with the back end of said base member for the purpose oi' admitting electrical con# tact wires to said second recess.

WILLIAM F. MCINTOSH. 

